The number of adolescent deaths from AIDS has tripled over the last 15 years, most of the patients having acquired the disease when they were infants, according to new data released by Unicef.

AIDS is the number one cause of death among adolescents in Africa and the second leading cause of death among adolescents globally. Among HIV-affected populations, adolescents are the only group for which the mortality figures are not decreasing, says Unicef.